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Capacitors with high quality of frequency characteristics are necessary for reference partial discharge (PD) calibrator. For this purpose, two methods to measure the internal inductance of three-terminal capacitors have been discussed. One is by LCR meter, the other method is based on the underdamped response of a series RLC circuit. Measurement results show that the latter is better.
The calibration of apparent charge, which can be traced to AC voltage and capacitance, for partial discharge(PD) calibrator is discussed. The methods of fast sampling measurement of peak-to-peak amplitude for step voltage by digital multimeter and the arithmetic in the automatic measurement of apparent charge by digital oscilloscope are focused on. Then, other factors, such as impulse waveform and...
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